Interference and Diffraction

A : There is no specific important physical difference between interference and diffraction. R : When there are only few sources (say two), the result is usually called interference, but if there is a large number of sources, the result is diffraction.

Assertion : Intensity pattern of interference and diffraction are not same. Reason : When there are few sources of light, then the result is usually called interference but if there is a large number fo them, the word diffraction is more often used.

Assertion : Intensity pattern of interference and diffraction are not same. Reason : When there are few sources of light, then the result is usually called interference but if there is a large number fo them, the word diffraction is more often used.

In interference and diffraction of light, dark and bright bands are seen on the screen.In an interference pattern, the ratio of maximum intensity to minimum intensity is 36:9. Find the ratio of amplitudes and intensities of the two interfering waves.

Both in interference and diffraction phenomena, alternate dark and bright fringes are obtained on screen i) generally fringe width is same in interference and not same in diffraction ii) the central fringe in interference has maximum brightness and thei intensity gradually decreases on either side iii) in interference the intensity of all bright fringes in same iv) both the phenomena are produced from same coherent sources

(a) Describe any two characteristic features which distinguish interference and diffraction phenomenon. Derive the expression for the intensity at a point of the interference pattern in Young.s double slit experiment. (b) In the diffraction due to a simple slit experiment, the aperture of the slit is 3 mm. If monochromatic of wavelength 620 nm is incident normally on the slit, calculate the separation between the first order minima and the third order maxima on one side of the screen. The distance between the slit and the screen is 1.5 m.

Describe any two characteristic feature which distiguish interference and diffraction phenomena. Derive the expression for the intensity at a point of the interference pattern in Young's double slit experiment. (b) In the diffration due to single slit experiment, the aperture of the slit is 3 mm. If monochromatic light of wavelength 620 nm in incident normally on the slit, calculate the separation in between the first order minima and the 3^("rd") order maxima on one side of the screen. The distance between the slit and the screen is 1.5 m.

Which of the following properties show that light is a transverse wave? a) Reflection b) Interference c) Diffraction d) Polarization